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Question

Statement (I): Rapid method of concrete mix-design will take 3 days for trials. Statement (II): This rapid method depends on curing the concrete in warm water at or above 55C.

A
Both statements - I and statements-II are individually true and statement-II is the correct explanation of statement- I
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B
Both statements - I and statements-II are individually true and statement-II is the NOT correct explanation of statement- I
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C
Statement- I is true but Statement-II is false.
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D
Statement- I is false but Statement-II is true.
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Solution

The correct option is A Both statements - I and statements-II are individually true and statement-II is the correct explanation of statement- I
Rapid method of concrete mix design reduces the period for finding the strength of trial mixes from 28 days to 3 days only.
Accelerated curing method as per I.S. 9013-1978
is Boiling water method in which specimens are cured at 27 ± 2C for 23 ± 14 hours under standard moist conditions.
Warm water methods in which specimens are immersed in water at a temperature of (55 ± 1C) and cured for 20 hours ± 10min.

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